Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2ead78b217d24f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 16:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35655260ddbb49adc4c6b53bb14263e4 SHA-1: 89c3acd68eaba9133547d84026a6d793af05f327 SHA-256: 6e2ead78b217d24fb9b56fdb3b2da14b96dd915379c3413bc7b5763ed9bf18d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=add+locale+android PDF link annotation
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/27921149995.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/sixugiramatudeguwunas.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/vifokidimejewegojodovo.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/1304787918.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/dufelizuvenovelofit.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/domosikubanabawiwanalu.pdfIn PDF document text
    • https://norservis.info/files/files/jobezafixogow.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30682328080.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-12/20210912122851815674.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161b161f1d---97738693722.pdfIn PDF document text
    • http://only-svet.ru/upload/files/xifad.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/gefisibitazirixiwuw.pdfIn PDF document text
    • https://fishuntpesca.it/file/48011768462.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/14849377590.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/bogonavutirixidefuxoli.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/57622610244.pdfIn PDF document text
    • https://bloc-immo.com/images/73813236880.pdfIn PDF document text
    • http://aven.su/userfiles/file/sajazojena.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/remosaseku.pdfIn PDF document text
    • http://malifer.hu/upload/file/57088371444.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/14508055768.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/vekilum.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vomuderegozajavunejata.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090704361173499.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/42790988141.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/63737692828.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 10080 bytes
SHA-256: 9ce07d63389e8d95265bb3eb7da6efcdd3a66fe30ba1b0b821c44d7d3fb94d9a
font_01_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 17300 bytes
SHA-256: b8ac626c6949501c092fc145b605d29338bd7998a9370e21f211706e80f86ac0